Stay bolt



Aug. 30, 1932. A. F. mm

STAY 130m Filed July 25. 1931 INVENTOR lql'fllur FP/f/(ll? I APT RNEY Patented Aug. 30, 1932 I ED STA S PATE OFFICE f a rtime r;rrrxmforsonnnnc'ranr; NEW YORK 'STAY Application filed July 25, This invention relates I to staybo lts. and particularly to staybolts'of the articulated yp a 1.

The object of the invention is to provide a staybolt embodying an articulation designed to prevent thev binding or crampinguof its co-ordinated members due to friction be-. tween its members and to the formation of scale accumulation in the interior of, the articulation.

In the accompanying drawing Figure 1 is a longitudinal central section, through a staybolt structure, embodying the present invention; Fig. 2 is a side viewof the intermediate member of thestaybolt structure of Fig. 1; Fig. 3 is a'longitudinal central section through a modified form of tlie intermediate member of the staybolt structure; and 1 is anend view of Fig.3. 1 p In the operation of staybolt structures of the general class to which the present invention relates, objectionable results are ex perienced where the water ofthe' boiler in which the staybolt isemployed, contains chemical elements, and scale enters the spaces between the heads and sockets of the joined ends of the members of the staybolt, structure. This scale accumulatesto the extent of completely filling the spacesand in effect so locks the ar'ticulatedsections and produces in effect a rigid staybolt. Likewise in articulated staybolts of the ordinaryvhead and socket type, an objectionable binding or cramping between the joined members ofthe 3!! bolts has resulted due to the actionfof-friction between their heads and sockets.

Variousstaybolts have been designed for the purpose of preventing the objectionable formation of scale, as well as for preventing the objectionable friction between the heads and sockets of the articulated members. In the U. S. Patent #1550587, issued to the applicant herein, on March 18, 1930, there is described a staybolt structure which em bodies an articulation designed to effectually prevent friction in operation and the binding or cramping between itslco-ordinated members which would be -caused thereby. The staybolt of the-instant invention embodies the desirable features of the structure disclosed BOL'J."

193-1. serial n. 553,046. i

in the patent, but it will be apparent that the instant invention is not confined to this strucmm but may be embodied in any staybolt which. comprises-a head and socket articu lation of a type similar to that illustrated in 7 said patent. V

In the practice of the invention, referring to the specific embodiments thereof, which are herein exemplified, the staybolt structure comprises three articulated members, to .wit, an end member 1, an intermediate member 2 and an end member 3. j s The end member '1 comprises a tapered plug 4., a short neck portion 5, and a head 6. The head is of a diameter sufiiciently greater I than the diameter of the neck portion of the member, to provide an annular bearing face 7 The bearing face is substantially flat and at a right angle to the axial line of the member, or it may beequivalently slightly curved on a comparatively long radius struck from said axial line. The plug portion of the member is of tubular section, its shell being made only of sufficient thickness to safely resist the strain to which it is exposed in service, and a tell-tale hole 8 is formed in the member, partly extending into the head and communicatingwith the interior of the tubular portion. The plug is fitted into an opening -9, of correspondingform, in an outer 30 Sheet 10, of the boiler to which the staybolt structure is to be applied, and the plug is secured in place in. the ordinary mannersuc as by welding 11, ashereinafter more fully described. i V j 1 The intermediate member 2, of the stayboltstructure comprises a bolt having a solid cylindrical body portion 12, and heads 13 and 14 formed on each of its ends. Each of the heads is recessed to provide sockets 15 and 16 forthe reception of the head of an 'end member. Inwardly projecting flanges 17 and 18 are formed on the heads 13 and 14:

near the ends of thesockets 15 and 16 respectively, the flanges providing annular bearing faces 19 and 20 respectively, on which bearing. faces, the bearing faces of the end members are adapted to abut when the threesections of the staybolt structure are assembled, asyhereinafter explained.

, riveted over as shown in the boiler, and the cut off and riveted over the staybolt The endmember 3 is in the form of a bolt, and is provided with aB'QXtGIIIZLl thread 21 at its outer end, which thread is screwed into an inner sheet 22, of the boiler to which the staybolt is applied, the threaded portion being of sufiicient length to extend through a threaded opening 32 formed in the sheet for a proper distance to enable'an outer head 23 to be formed on the end of the member; The head 23 is formed by riveting over the end of the member 3 on the inner side of the sheet, as hereinafter more fully described. A rounded head 24., similar to the head 6, of the end member 1, is formed on the inner end of the member 3, and is provided with an annular bearing face'25 similar to the bearing face 7. A tell-tale hole 26 is formed axially in the member 3, extending through the head 23 and" slightly into the head 24'.

In the assembled staybolt'structure the heads 6 and 24 are disposed within the sockets 15. and 16 respectively. The bearing face 7 of the head 6 abuts against the bearing face 19 in the socket 15 and'the bearing face 25 of the head 24 abuts against the bearing face 20 in the socket 16; The assembled staybolt structure is applied to the boiler by inserting the same through the opening 9 in the outer shoe-J10 until the free end of the member 8 projects through the opening 32 in the inner boiler sheet 22. Before being Fig. 1, this end is formed with a squared wrench fit (not shown). The fit is gripped with a wrench, applied from the interior of the firebox of member '3 is screwed into the inner boiler sheet until the member 1 has been drawn into place in the outer sheet, in which place it is secured as aforesaid welding 11. The member 3 is then further screwed into the sheet 22 until the staybolt structure is drawn to the desired tension, after which the free end of the member '3 is at 23 as aforesaid, thereby making a tight jointwith the sheet. All of the characteristics of the staybolt structure which have thus far been described in detail are likewise embodied in the'structure of the patent hereinbefore referred to.

Referring now to the characteristics of structure wholly novel to the present invention, the intermediate member 2 is provided with passages 26 and 27, and 28 and 29, in its heads 13 and 14 respectively. The passages 26 and 27 lead from the outside of the head 13 to the interior of the socket 15, and comprise substantially round holes shaped and positioned so as to meet exactly at the interior surface of the socket and to form a point or cutting edge 30. Correspondingly the passages 28 and 29 lead from the outside of the head 14 to the interior of the socket 16 and comprise similarly shaped and positioned holes which meet exactly at the interior surface of the "to 29 provide the substantiallyflat socket 16 and form a point or cutting edge 31.

In addition to the cutting edges 30 and 31, where the two passages meet, the corners of the holes 26 to 29, where they enter the sockets 15 and 16, form cutting or scraping edges on their entire circumference which will break up the scale when it is forced against them by the movement of heads 6 and 24. Thus, the forming of the holes 26 means for the disintegration of the scale as well as affording apertures for its extrusion.

Referringto the modified form of the intermediate member of the staybolt structure which is illustrated in'Figs. 8'and 4, this member 2a has all of the characteristics of the member 2, except that here the member is made relatively short so as to be used in a staybolt structure adapted for restricted spaces in a boiler, and in order to permit the making of the member of such short length, the joining passages of its opposite ends are formed in different planes, instead of the same plane as is shown in the case of the member 2. Thus the passages 28a and 29a for the head 14a are formed in a plane at right angles to the plane of the passages 26a and 27a for the head 13a. It is obvious that the pairs of passages in the intermediate member of Fig. 1 may be disposed in planes at an angle to each other. It is further obvious that the socket and headforming the articulation may be reversed, the socket appearing in the end section, and the head appearing in the intermediate section of the bolt. I

' It will be understood that in operation, the inner and outer sheets of the boiler move relatively to each other and that at such i times, where articulated staybolts are used, oscillating movements of the end members in their sockets take place. By reason of coacting bearing faces on the heads of the the sockets of the intermediate member, a relative rocking movement is efiected between the joined sections, instead of the in juri'ous relative sliding movement therebetween which takes place when the articulations comprise heads and sockets of the usual type and construction. There is thus prevented the bindingor gripping between the co-ordinating members which would result from friction caused by the relative sliding movement. Further the passageways provided in the ends of the intermediate member permit the circulation of the boiler water through the sockets thus tendingto effect the removal of boiler scale of the articulations. In the event, however, that the passages do become filled with boiler scale so as to threaten a locking of the articulated parts of the staybolt structure and the forming of an efl ectuallyrigid member, V

outer members and in from the interior T1 Where the relative'fmovemnt'. of the inner ends of the staybolt structure 'closer together,

its effect will likewise befto push the scale and outer boilersheets tends to bring the in the sockets against thecutting edges and toforce it out through thepassages, The operation of the stay 7 case ofthe usegof either? the intermediate section 2'or the intermediate section 2a.

While there has been hereinbefore described specific embodiments of the invention, it will be apparent that various changes and modifications in form andstructure may be made therefrom without departing from the spirit of the invention and that all and any such changes and modifications as fall within the scope of the appended claims are contemplated as a part of the instant invention. I

The invention claimed and desired to be secured by Letters Patent is:

1. An articulation for the sections of a staybolt structure comprising a head; and a socket engaging said head and having a passageway formed therein for permitting the extrusion of scaleaccumulations from its interior.

2. An articulation for the sections of a staybolt structure comprising means for flexibly joining the sections together; means for permitting the extrusion of scale accumulations from the jointure uponthe relative movement of said sections and means for facilitating said extrusion.

3. An articulated staybolt comprising a pair of sections joined together for relative angular movement, th space between opposed adjacent faces of the sections; and a passageway opening said space to the exterior of the bolt, whereby objectionable foreign solid matter within said space may be extruded therefrom.

4. An articulation for sections of a staybolt structure comprising a head'for one section; and a socket for another section engaging said head, said head and socket being adapted for relative rocking movement and said socket being provided with a wedge and an aperture whereby said rocking movement will effect a disintegration of scale accumulations within said socket and extrusion of said scale accumulations through said aperture.

5. An articulation for the sections of a staybolt structure comprising a head for one section; and a socket for another section, said socket engaging said head and permitting relative movement therebetween and being provided with apertures forming an edge at its inner surface, whereby upon relative movement of the olt' is identical. in the e jointure providing a' head and socket a dis-- cumulations will be'extruded through said,

apertures. 7

6LA staybolt structure comprising end members respectively securable to the inner and outer sheets of a steam boiler; an intermediate member; and articulations connecting said intermediate member'to said end members, one of said articulations providingfaspace opposed adjacent faces between of its connected members a and having a passageway in one of its connected members for permitting the extrusion of scale accu' mulatio'ns from said space.

7 A staybolt comprising an intermediate member having sockets at'its ends provided with'substantially flat bearing faces; and endmembers 'havinghea ds provided with substantially flat bearing faces, the said socketsengaging the said heads and the respective bearing faces being disposed opposite to each other so as tive rocking movement between thearticulated sections without creating relative sliding movement, and one of said sockets having apertures formed therein j oining at its inner surface so as to provide a cutting edge whereby scale accumulations within 'said socket willbe disintegrated and extruded through the apertures by the relative rocking movement between the articulated sections.

' 8 An'articulated staybolt'having opposed end portions adapted to be secured respectively in the inner and outer sheets of a steam boiler; a tension resisting intermediate portion having a substantially flat face ateach end, each of said end portions being provided atone end thereof with a substantially flat I. ,a

face engaging a corresponding face of the tension resisting portionwhen in assembled position to form a jointur'e therebetween, said coactin'g facesprovidi'ng for a rocking move ment between said end portions and the tension resisting intermediate portion without creating relative sliding 'movement; and a "passageway opening the interior of at least one of said jointu'res to the exterior ofthe bolt, whereby objectionable foreign solid matter within said jointure may be extruded therefrom.

9. An articulated staybolthaving opposed end portions adapted to be secured respectively in the inner and outer sheets of a steam boiler; a tension resisting intermediate portionhaving a substantially flat face at each end, each of said end portions being provided at one end thereof with a substantially flat face engaging acorresponding face of the tension resisting portion when in assem- "bled position to form a jointure therebetween,

saidcoacting faces providing fora rocking -movement between said end portions and the tension resisting intermediate portion withto provide fora rela out creating relative sliding movement; a passageway opening the interior of at least one of said jointures to the exterior of the bolt for'permitting the extrusion of foreign solid matter from said jointure; and means for facilitating said extrusion upon relative movement of the joined portions.

V 10. An articulated sectional staybolt comprising a tension resisting intermediate section, having a socket at an end thereof provided with a substantially flat face in its interior, an adjacent tension resisting section having a head at an end thereof provided with a substantially flat face, said head-being disposed within said socket, said substantially flat faces engaging each other, effecting an articulation between said sections, and providing for a relative rocking movement between the sections without creating relative sliding movement, and said socket hav- ARTHUR, F. PITKIVN,

ing an aperture formed therein permitting the extrusion of scale accumulations from its interior; and a tension resisting section adj acent and connected to the opposite end of the intermediate section effecting an articulation therebetween, the outer ends of said adjacent tension resisting sections being adapted to be rigidly secured respectively to the inner and outer sheets of a steam boiler.

11. An articulated sectional staybolt comprising a tension resisting intermediate section having a socket at an end thereof provided with a substantially flat face in its interior; an adjacent tension resisting section having a head at an end thereof provided with a substantially flat face, said head being disposed within said socket and said substantially flat faces engaging each other, effecting an articulation between said sections, and providing for a relative rocking'movement between the sections without creating rela tive sliding movement, and said socket having apertures formed therein joining at its inner surface and forming a cutting'edge whereby v scale accumulations Within the socket will be disintegrated and extruded through said apertures by the relative rocking movement between the sections of' the staybolt; and a tension resisting section adjacent and connected to the opposite end of the intermediatesection effecting an articulation therebetween, the outer ends of said adjacent tension resisting sections being adapted to be i rigidly secured respectively to the inner and I outer sheets of a steam boiler.

12. An articulated sectional staybolt comprising a tension resisting intermediate section having a socket at an end thereof provided with a substantially flat face in its interior; an adjacent tension resisting section having a head at an end thereof provided with a substantially fiat face, saidhead being disposed within said socket, said substantially fiat faces engaging eachother toform 'ajointu're therebetween and providing for a 

